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I am currently analyzing Cross Classified Multiple Membership Growth Curve Model using runmlwin.
And I used Professor Bess Rose's data and runmlwin code for this study.
My question is about ID at Level1.
That is, what code should be used for runmlwin at level 1 and what the structure of the data should be
Bess Rose's runmlwin code is below

Bess used the sign "lev1_id" as the at Level1. But I could not understand the exact data of it.
The first level of data structure Bess Rose has shown for each id gives a variety of values.(refernce. attached file)

In general, in the case of the multi-level growth model, the first level is the measurement point(or occasion), the second level is the individual, and the third level is the group.
If so, should not level 1 be the measurement point, or occation value?

My model is the same as the picture file shown below.(refernce. attached file)